NEW YORK (360Dx) – After a bountiful April, the 360Dx Index recorded a more modest May, as it rose a little more than 2 percent month over month.

The increase compares to a nearly 5 percent gain by the index month over month in April.

Exact Sciences led the gainers, followed by Natera and Qiagen, while Invitae and Opko Health paced the decliners. Overall, 17 companies in the index saw their stock prices go up last month, while nine companies' share prices took a tumble.